Free Printable WorksheetScienceGrade 11Science CurriculumNGSS HS-PS1-1, HS-PS1-7; AP Chem Units 1 and 4; Pre-AP Unit 3; CCSS HSN-Q.A.1-3 and MP6

11.31 Molar Mass and Particle Mass Conversions Worksheet

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Worksheet Overview & Skills Covered

Core academic competencies and curriculum alignment

This Chemistry Science worksheet provides structured practice on 11.31 Molar Mass and Particle Mass Conversions. Students are guided through targeted exercises that build foundational understanding, computational accuracy, and critical thinking skills.

Molar Mass and Particle-Mass Conversions: Calculate molar mass and convert among mass, moles, particles, and number of atoms within a chemical formula. Aligned to NGSS, CCSS, AP Chemistry/Pre-AP Chemistry, and representative state chemistry framework crosswalks NGSS HS-PS1-1, HS-PS1-7; AP Chem Units 1 and 4; Pre-AP Unit 3; CCSS HSN-Q.A.1-3 and MP6 - Molar Mass and Particle-Mass Conversions Chemistry Standards Crosswalk: National: NGSS HS-PS1-1, HS-PS1-7; AP Chem Units 1 and 4; Pre-AP Unit 3; CCSS HSN-Q.A.1-3 and MP6. State frameworks: TX TEKS 112.43(c)(7)-(9); FL SC.912.P.8.7, P.8.9; MA HS-PS1-9(MA); GA Chemistry formula/stoichiometry standards; VA Chemistry nomenclature/mole standards.

Whether you are an educator preparing classroom handouts, a tutor reinforcing weekly topics, or a parent supporting homeschool learning, this printable resource gives students the deliberate practice required to achieve subject fluency and master state standards.

Grade

Chemistry

Subject

Science

Domain

Science Curriculum

Formats

PDF & DOCX

Sample Practice Problems

Preview the types of problems and questions covered in this worksheet

Below are sample questions representative of the exercises included on this worksheet and related 11.31 Molar Mass and Particle Mass Conversions skill assessments:

Problem 1Difficulty: Mastery

An aluminum sulfate sample is described by sulfur atom count. A sample of Al2(SO4)3 contains 5.00 × 10²¹ S atoms. What is the mass of the Al2(SO4)3 sample? Use Al2(SO4)3 = 342.14 g/mol and 6.022 × 10²³ particles/mol.

A2.84 g Al2(SO4)3

B2.77 × 10^-3 mol Al2(SO4)3

C0.0947 g Al2(SO4)3

D0.947 g Al2(SO4)3

Solution & Explanation:Because each Al2(SO4)3 particle contains 3 S atom(s), first divide the atom count by 3, then by Avogadro's number to get 2.77 × 10^-3 mol Al2(SO4)3. Multiplying by 342.14 g/mol gives 0.947 g.

Problem 2Difficulty: Mastery

A barium nitrate sample is analyzed for oxygen atoms from its formula. How many O atoms are in 3.80 g of Ba(NO3)2? Use Ba(NO3)2 = 261.35 g/mol and 6.022 × 10²³ formula units/mol.

A8.76 × 10²¹ O atoms

B0.0145 mol Ba(NO3)2

C5.25 × 10²² O atoms

D5.25 × 10²¹ O atoms

Solution & Explanation:Convert mass to moles of Ba(NO3)2, then to particles, then multiply by the O subscript. 3.80 ÷ 261.35 = 0.0145 mol, and 0.0145 × 6.022 × 10²³ × 6 = 5.25 × 10²² O atoms.

Problem 3Difficulty: Mastery

A barium nitrate amount is used to count total atoms in formula units. How many total atoms are represented in 0.0400 mol of Ba(NO3)2? Use the formula subscripts and 6.022 × 10²³ formula units/mol.

A2.41 × 10²² atoms

B2.17 × 10²³ atoms

C0.360 mol atoms

D2.17 × 10²⁴ atoms

Solution & Explanation:A formula unit of Ba(NO3)2 contains 9 total atoms. Use 0.0400 mol × 6.022 × 10²³ × 9 = 2.17 × 10²³ atoms.

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Frequently Asked Questions

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QWhat grade level and standards does this worksheet align with?

This worksheet is designed specifically for Chemistry Science students. It aligns with educational standard NGSS HS-PS1-1, HS-PS1-7; AP Chem Units 1 and 4; Pre-AP Unit 3; CCSS HSN-Q.A.1-3 and MP6 (National: NGSS HS-PS1-1, HS-PS1-7; AP Chem Units 1 and 4; Pre-AP Unit 3; CCSS HSN-Q.A.1-3 and MP6. State frameworks: TX TEKS 112.43(c)(7)-(9); FL SC.912.P.8.7, P.8.9; MA HS-PS1-9(MA); GA Chemistry formula/stoichiometry standards; VA Chemistry nomenclature/mole standards.).